Phantom behavior via cosmological creation of particles

Abstract

Recent determinations of the equation of state of dark energy hint that this may well be of the phantom type, i.e., $w_{de}<-1$. If confirmed by future experiments, this would strongly point to the existence of fields that violate the dominant energy condition, which are known to present serious theoretical difficulties. This paper presents an alternative to this possibility, namely, that the measured equation of state, $w_{de}$, is in reality an effective one, the equation of state of the quantum vacuum, $w_{\Lambda }=-1$, plus the negative equation of state, $w_c$, associated to the production of particles by the gravitational field acting on the vacuum. To illustrate this, three phenomenological models are proposed and constrained with recent observational data.

20 pages, 6 eps figures, to be published in the Physical Review D

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• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Two-fluid solutions of particle-creation cosmologies
• Challenging matter creation models in the phantom divide
• The Impact of Particle Production on Gravitational Baryogenesis
• Entropy production due to adiabatic particle creation in a holographic dissipative cosmology
• Gravitationally induced particle production and its impact on structure formation
• Emulating dark energy models with known equation of state via the created cold dark matter scenario
• Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
• Cosmological solutions in spatially curved universes with adiabatic particle production
• Evolving Cosmic Scenario in Modified Chaplygin Gas with Adiabatic Matter Creation